new look, internationalle, peacocks, george,
FashionTiy
zumiez and tillys
Gap and Gymboree are good stores for little girls clothing.
Fast food places generally... and some clothing stores will hire 16 year olds.
Good online clothing stores for teenagers would be a teen based store.us A store that specialises in especially for teen style. Stores such as wetseal, rue 21, forever 21 arsenal stores teenagers would be interested in.
Try sites like eBay or amazon. Some discount stores have good deals. Check for sales at stores. The swapmeet might some times have cheap cute girl clothing.
JC Penny's, Macy's, Target (not fully clothing), WalMart (not fully clothing), Nordstrom, and many other stores.
In the UK the stores Pumpkin Patch and Mothercare specialise in children's clothing, however, one can also find a good selection at Next, Asda, Tesco and Gap.
You can buy many plus size clothing, for low, reasonable prices at Wal-Mart. If you aren't on a budget some good stores may be Kohl's, JCPenny, and Target.
You can find casual clothing just about everywhere. Some popular clothing stores for business casual wear would be JCpenney, Macy's, Ross, and Kohl's. They have a good selection of clothes you are looking for.
garage, Aeropostale, American eagle, hollister, Abercrombie and Fitch, and campuscrew
Some good online stores are overstock.com. Or you can check the stores that have specials online only. Sometimes, Old Navy, Banana Republic have specials for online customers such as free shipping.